我有一个ViewController
与3 subviews
:
预期:
如果'username'dan'password'字段字符大于0,则“启用”登录按钮。
实际:
Observable已更改,按钮仍处于禁用状态。
代码:
import UIKit
import RxSwif
import RxCocoa
struct LoginViewModel {
let username = Variable<String>("")
let password = Variable<String>("")
var isValid : Observable<Bool>{
return Observable.combineLatest(username.asObservable(), password.asObservable(),
resultSelector:{ (un,pw) -> Bool in
return un.count > 0 && pw.count > 0
}
)
}
}
class LoginViewController: UIViewController {
@IBOutlet weak var tUsername : UITextField!
@IBOutlet weak var tPassword : UITextField!
@IBOutlet weak var bLogin : UIButton!
var viewModel = LoginViewModel()
var disposeBag = DisposeBag()
override func viewDidLoad() {
super.viewDidLoad()
self.viewModel.username.asObservable().map({$0 }).bind(to: self.tUsername!.rx.text).disposed(by: disposeBag)
self.viewModel.password.asObservable().map({$0 }).bind(to: self.tPassword!.rx.text).disposed(by: disposeBag)
self.viewModel.isValid.map({$0}).bind(to: self.bLogin!.rx.isEnabled).disposed(by: disposeBag)
}
}
你以错误的方式完成了绑定尝试下面的代码:
self.tUsername!.rx.text.map {$0 ?? ""}.bind(to: viewModel.username).disposed(by: disposeBag)
self.tPassword!.rx.text.map {$0 ?? ""}.bind(to: viewModel.password).disposed(by: disposeBag)
viewModel.isValid.bind(to: bLogin.rx.isEnabled).disposed(by: disposeBag)